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100 mL of a colloidal solution is completely precipitated by addition of 5 mL of 1 M Nacl solution . Calculate the coagulation value of Nacl .


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Answer : 50
Explanation :
Cogulation value is the millimoles of an electrolyte that must be added to 1 L of a colloidal solution for complete coagulation .
Therefore , 5 mL of 1 M Nacl = $\large\frac{1}{1000}\times 5 = 0.005 $ or 5 m moles .
100 mL of a colloidal solution require Nacl for complete coagulation = 50 m moles
Therefore , Coagulation value of Nacl = 50
answered Mar 19, 2014 by yamini.v

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